Samsung AC140KNPDEH - External Sensor Error (Error Code: E221, E231, E251, E320)

Troubleshooting
4-12 Samsung Electronics
4-3-5 External Sensor Error (Error Code: E221, E231, E251, E320)
1. Test Item
1) Check the connection of the temperature sensor connector.
2) Check the resistance value of the temperature sensor.
2. Check procedure
Error Code Description
E221 Error of the temperature sensor of the outdoor unit
E231 Error of the COND. sensor of the outdoor unit
E251 Error of the discharge sensor of the outdoor unit
E320 Error of the OLP sensor of the outdoor unit
Power OFF
Is the temperature sensor connector
reconnected?
No
Yes
Yes
Replace the temperature sensor, ױ
Power ON. ױ
After confirming the state is normal, end the service.
No
Is the temperature
sensor-measuring resistance similar to the
table on the left?
After confirming the state is normal,
end the service.
No
Yes
Replace the outdoor unit PBA. ױ
Power is on. ױ After confirming the state is
normal, end the service.
(Example) COND. sensor/outdoor unit temperature sensor measuring resistance value by temperature: E231, E221
(Example) OLP sensor/discharge temperature sensor measuring resistance value by temperature: E320, E251.
Current tem-
perature (°C)
Resistance
(KΩ)
Current tem-
perature (°C)
Resistance
(KΩ)
70 4 20 10
60 5 10 20
50 6 0 30
40 7 -10 40
30 8
Current tem-
perature (°C)
Resistance
(KΩ)
Current tem-
perature (°C)
Resistance
(KΩ)
80 40 30 180
70 50 20 220
60 60 10 320
50 90 0 550
40 110
Is the temperature sensor connector
connected?
e.g.) Room temperature: 26ఁ
- Resistance: 10.28 KΩ
e.g.) Room temperature: 21ఁ
- Resistance: 205.4 KΩ
Does the same error occur again
after power is on?